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You are seeing a 15yo patient with past psychiatric history who takes escitalopram (Lexapro) and quetiapine (Seroquel) for nausea and vomiting. You give the patient a dose of ondansetron (Zofran) and an IV fluid bolus, then discharge him home with a prescription for ondansetron. His parent gives him diphenhydramine (Benadryl) before bed to help him fall asleep. He becomes upset and overdoses on one of the medications in the home. 

Which of the drugs available is associated with severe QTc prolongation in overdose?
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